compositor-worker: cc->blink mutation plumbing

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <set>
 #include <unordered_map>
 #include <utility>
 
 #include "base/auto_reset.h"
+#include "base/bind.h"
 #include "base/containers/small_map.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/animation/animation_events.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
@@ skipping 3218 matching lines @@
   viewport()->PinchEnd();
   top_controls_manager_->PinchEnd();
   client_->SetNeedsCommitOnImplThread();
   // When a pinch ends, we may be displaying content cached at incorrect scales,
   // so updating draw properties and drawing will ensure we are using the right
   // scales that we want when we're not inside a pinch.
   active_tree_->set_needs_update_draw_properties();
   SetNeedsRedraw();
 }
 
+scoped_ptr<BeginFrameCallbackList>
+LayerTreeHostImpl::ProcessLayerTreeMutations() {
+  // TODO(majidvp): This is where we turn |LayerTreeMutationsCallback| into
+  // a list of closures.
+  auto callbacks = make_scoped_ptr(new BeginFrameCallbackList());

[esprehn, 2016/03/22 21:16:49]

just return it? Why do we need the local?

[majidvp, 2016/03/23 22:24:53]

Fixed.

+  return callbacks;
+}
+
 static void CollectScrollDeltas(ScrollAndScaleSet* scroll_info,
                                 LayerImpl* layer_impl) {
   if (!layer_impl)
     return;
 
   gfx::ScrollOffset scroll_delta = layer_impl->PullDeltaForMainThread();
 
   if (!scroll_delta.IsZero()) {
     LayerTreeHostCommon::ScrollUpdateInfo scroll;
     scroll.layer_id = layer_impl->id();
@@ skipping 714 matching lines @@
   return task_runner_provider_->HasImplThread();
 }
 
 bool LayerTreeHostImpl::CommitToActiveTree() const {
   // In single threaded mode we skip the pending tree and commit directly to the
   // active tree.
   return !task_runner_provider_->HasImplThread();
 }
 
 }  // namespace cc